08:15AM | 02/21/04
Member Since: 02/20/04
6 lifetime posts
My question is whether it is advisable to install a vapor barrier below grade on the inside of an insulated wall? for example, my basement wall is a block wass. I framed the inside walls with 2X4's. I then insulated with fiberglass batts. Should i install a vapor barrier over the insulation?


04:48PM | 02/26/04
Member Since: 01/28/03
693 lifetime posts
As long as you used fiberglass insulation with a kraft faced vapor barrier directed toward the inside or heated side fo the room, the answer is:

You do not need a plastic sheet vapor barrier over the insulation.

If you used simple unfaced fiberglass batts between the 2x4s, then you would still not use a plastic polyethylene sheet vapor barrier.

You would instead use builder paper, tar paper or some other type minimally vapor transmissive barrier other than plastic.



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